New York Geo with bad water help needed

I have a geo system in Long Island that had good water quality 6 years ago when dug. Now it is producing high levels of Iron/mag/scale, throwing my system into a fit. We have dug other test wells from 80’ to 200’ feet with the same issues, neighbors have good water. I’m have other test wells dug on other areas of the property tomorrow, but if the resulting water quality is the same, I’m being told that a Closed Loop system is the only way to solve the problem. Need professional opinions before pulling the trigger on the cost of a closed loop. Well digging company says he’s seen this issue in less then 10 wells he’s dug in the past 30 years. Any advice would be greatly appreciated.